tosca_definitions_version: tosca_simple_yaml_1_1

imports:
  - examples: tosca/tosca-examples-types.yaml

topology_template:
  node_templates:
    my_server:
      type: tosca.nodes.Compute
    db:
      type: tosca.nodes.DBMS.MySQL
      requirements:
        - host: my_server
      interfaces:
        Standard:
          stop: stop.sh

  workflows:
    backup:
      description: Performs a snapshot of the MySQL data.
      preconditions:
        - target: my_server
          condition:
            - assert:
              - state: [{equal: available}]
        - target: my_server
          condition:
            - assert:
              - state: [{valid_values: [started, available]}]
              - my_attribute: [{equal: ready }]
      steps:
        backup_step:
          target: db
          filter: # filter is a list of clauses. Matching between clauses is and.
            - or: # only one of sub-clauses must be true.
              - assert:
                - foo: [{equals: true}]
              - assert:
                - bar: [{greater_than: 2}, {less_than: 20}]
          activities:
            - call_operation: Standard.stop